Interpret ntoskrnl.exe NT Kernel ICMP Type 8 Echo requests

How do you interpret this Sygate Personal Firewall message?

I did not initiate (at least not on purpose) any ping of 204.152.33.21.
In fact, I don't even know what that is (I looked it up on a reverse DNS
and it came up empty).

Why is my Windows XP PC wireless port (00-0d-60-20-23-31 MAC address )
asking to connect, all on its own, to 204.152.33.21?

Here is the full Sygate message that asked me to accept or deny.
How do I glean clues from this supposedly detailed report so I can figure
out why it is doing this?

File Version : 5.1.2600.2622
File Description : NT Kernel & System (ntoskrnl.exe)
File Path : C:\WINDOWS\system32\ntoskrnl.exe
Process ID : 0x4 (Heximal) 4 (Decimal)
Connection origin : local initiated
Protocol : ICMP
Local Address : 192.168.0.101
ICMP Type : 8 (Echo Request)
ICMP Code : 0
Remote Name :
Remote Address : 204.152.33.21
Ethernet packet details:
Ethernet II (Packet Length: 120)
        Destination: 00-80-c8-b0-69-8a
        Source: 00-0d-60-20-23-31
Type: IP (0x0800)
Internet Protocol
        Version: 4
        Header Length: 20 bytes
        Flags:
                .0.. = Don't fragment: Not set
                ..0. = More fragments: Not set
        Fragment offset:0
        Time to live: 2
        Protocol: 0x1 (ICMP - Internet Control Message Protocol)
        Header checksum: 0xd708 (Correct)
        Source: 192.168.0.1
        Destination: 204.152.33.21
Internet Control Message Protocol
        Type: 8 (Echo Request)
        Code: 0
        Data (68 bytes)
Binary dump of the packet:
0000: 00 80 C8 B0 69 8A 00 0D : 60 20 23 31 08 00 45 00 | ....i...`C#I..E.
0010: 00 5C 01 10 00 00 02 01 : 08 D7 C0 A8 00 65 CC 98 | .\...........e..
0020: 21 15 08 00 F0 FF 03 00 : 04 00 00 00 00 00 00 00 | !...............
0030: 00 00 00 00 00 00 00 00 : 00 00 00 00 00 00 00 00 | ................
0040: 00 00 00 00 00 00 00 00 : 00 00 00 00 00 00 00 00 | ................
0050: 00 00 00 00 00 00 00 00 : 00 00 00 00 00 00 00 00 | ................
0060: 00 00 00 00 00 00 00 00 : 00 00 41 43 41 43 41 43 | ..........ACACAC
0070: 41 43 41 43 41 43 41 43 : | ACACACAC
Received on Mon May 1 00:50:50 2006